Wubei Zhi (Vol. 47)

Next, we address the use of identification tallies The specific design and dimensions of these tally-seals are detailed in a separate chapter. If the enemy’s momentum outside is surging and the hearts of the soldiers within are wavering, the commander must act to prevent conspiracies. He may rotate the left squad to the right, or move the front army to the rear. This may be done several times in a single day, or the positions might remain unchanged for several days This constant rotation was a tactic to prevent soldiers from forming secret cliques or plotting with specific local traitors in their assigned sectors.. Occasionally, the commander should secretly send men carrying counterfeit tallies counterfeit tallies (weiqi): fake versions of the official identification markers used to test if guards are properly inspecting credentials to patrol the lines and test whether the officers and soldiers are remaining vigilant.

In the city, all daily necessities, including water and liquids water and liquids (shuijiang): specifically referring to drinking water and thin porridges or medicinal drinks distributed during a siege, must be strictly rationed.

All civilian stoves stoves (zao): the communal or household cooking hearths must be constructed with open ventilation shafts and high chimneys to prevent accidental fires. Furthermore, a preemptive order must be issued: "Anyone who causes a fire shall be executed." This severity is intended to thwart traitors In ancient siege warfare, arson was the primary method used by internal "fifth column" agents to create chaos, signal the enemy, or destroy food stores..

Should a fire break out within the city, only the officials and laborers specifically assigned to that sector's defense are permitted to go and extinguish it. They must also send an urgent report to the Chief Commander Chief Commander (zhujiang): the supreme military authority in charge of the city's defense. The Chief Commander shall then dispatch his own trusted personal aides to the scene to oversee the efforts and hasten the work.

In the event of a fire or any unusual emergency or alarm, the Chief Commander shall order the striking of drums for five rounds. Upon hearing this signal:

• Officers and soldiers, whether atop the walls or below them, are strictly forbidden from leaving their assigned posts.
• Civilians are strictly forbidden from running about in the streets and alleys.